JPS627779B2 - - Google Patents
Info
- Publication number
- JPS627779B2 JPS627779B2 JP8931680A JP8931680A JPS627779B2 JP S627779 B2 JPS627779 B2 JP S627779B2 JP 8931680 A JP8931680 A JP 8931680A JP 8931680 A JP8931680 A JP 8931680A JP S627779 B2 JPS627779 B2 JP S627779B2
- Authority
- JP
- Japan
- Prior art keywords
- transistor
- power supply
- transformer
- terminal
- base
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 238000004804 winding Methods 0.000 claims description 20
- 230000010355 oscillation Effects 0.000 claims description 13
- 239000003990 capacitor Substances 0.000 claims description 12
- 238000010586 diagram Methods 0.000 description 3
- 230000007423 decrease Effects 0.000 description 2
- 229910052754 neon Inorganic materials 0.000 description 2
- GKAOGPIIYCISHV-UHFFFAOYSA-N neon atom Chemical compound [Ne] GKAOGPIIYCISHV-UHFFFAOYSA-N 0.000 description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 229910052732 germanium Inorganic materials 0.000 description 1
- GNPVGFCGXDBREM-UHFFFAOYSA-N germanium atom Chemical compound [Ge] GNPVGFCGXDBREM-UHFFFAOYSA-N 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 230000001960 triggered effect Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/338—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only in a self-oscillating arrangement
Description
【発明の詳細な説明】
この発明は電源装置に係わり、特にカメラの電
子発光装置等に使用可能な電源装置に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a power supply device, and more particularly to a power supply device that can be used in an electroluminescent device of a camera.
一般にストロボ用の電源装置は低圧直流電源の
出力を高圧直流に変換するDC―DCコンバータを
有する。第１図を参照して従来のストロボ用電源
装置を説明する。スイツチ１２を閉成するとトラ
ンジスタ２０が導通状態にされ、トランス１８の
一次巻線Ｐおよび帰還巻線Ｆに電流が流れる。こ
れによりトランス１８の二次巻線Ｓの両端に高圧
が印加され、この電圧が整流用ダイオード２２を
介して主コンデンサ２４に充電される。このコン
デンサ２４の両端が図示しない閃光放電管に供給
される。ここで、PNP型トランジスタ（ゲルマニ
ウムトランジスタ）２０は最大定格温度が85℃位
であり、NPN型トランジスタ（シリコントラン
ジスタ）のそれが150℃位であるので、同一定格
に対しては放熱板を大きくする必要があり、小型
化に適さない。また、価格の点でもPNP型トラン
ジスタは不利である。一方、NPN型トランジス
タを用いてDC―DCコンバータを構成すると、そ
の回路構成上トランスの一次側と二次側を分離で
きないので、電撃を受けやすく危険を伴なう欠点
がある。さらに、端子の数を減らさずにトランス
を小型化すると、各端子の間隔が狭くなる。ここ
で、トランスの二次側出力端子は1000〜2000Vに
達するので、出力端子と他の端子との耐圧が保て
なくなる。また、NPN型トランジスタのＶBEは
0.6〜0.8Vであり、PNP型トランジスタのＶBEが
0.1〜0.3Vであるので、NPN型トランジスタを用
いたDC―DCコンバータは発振させるのに比較的
高電圧を必要とするので、電源電圧が低下したと
き、動作できなくなる虞れがある。 Generally, a strobe power supply device has a DC-DC converter that converts the output of a low-voltage DC power supply to high-voltage DC. A conventional strobe power supply device will be explained with reference to FIG. When the switch 12 is closed, the transistor 20 becomes conductive, and current flows through the primary winding P and the feedback winding F of the transformer 18. As a result, a high voltage is applied to both ends of the secondary winding S of the transformer 18, and this voltage is charged to the main capacitor 24 via the rectifying diode 22. Both ends of this capacitor 24 are supplied to a flash discharge tube (not shown). Here, the maximum rated temperature of the PNP type transistor (germanium transistor) 20 is around 85°C, and that of the NPN type transistor (silicon transistor) is around 150°C, so the heat sink should be made larger for the same rating. It is not suitable for miniaturization. PNP transistors are also disadvantageous in terms of price. On the other hand, when a DC-DC converter is constructed using NPN transistors, the primary and secondary sides of the transformer cannot be separated due to the circuit configuration, so there is a drawback that the converter is susceptible to electric shock, which can be dangerous. Furthermore, if the transformer is made smaller without reducing the number of terminals, the spacing between each terminal becomes narrower. Here, since the secondary output terminal of the transformer reaches 1000 to 2000V, the withstand voltage between the output terminal and other terminals cannot be maintained. Also, the V BE of the NPN transistor is
0.6 to 0.8V, and the V BE of the PNP transistor is
Since the voltage is 0.1 to 0.3V, a DC-DC converter using an NPN transistor requires a relatively high voltage to oscillate, so there is a risk that it will not be able to operate when the power supply voltage drops.
この発明の目的は、低電圧でも確実に動作し、
かつ、トランスの各端子間の耐圧を保ち小型化に
適し、電子発光装置等に使用可能な電源装置を提
供することである。 The purpose of this invention is to operate reliably even at low voltages,
Another object of the present invention is to provide a power supply device that maintains the withstand voltage between each terminal of a transformer, is suitable for miniaturization, and can be used for electroluminescent devices and the like.
以下図面を参照して、この発明による電源装置
の一実施例を説明する。第２図はその一実施例が
使用される電子発光装置の回路図である。直流電
源４０の正端子がスイツチ４２を介してNPN型
トランジスタ４３のエミツタに接続され、負端子
が抵抗４４を介してトランジスタ４３のベースに
接続される。発振トランス４６の一次巻線Ｐの一
端がスイツチ４２を介して直流電源４０の正端子
に接続され、他端がPNP型トランジスタ４８のコ
レクタに接続される。トランジスタ４８のエミツ
タは直流電源４０の負端子に接続され、ベースは
抵抗５０を介してトランジスタ４３のコレクタに
接続される。トランジスタ４３のベースは発振ト
ランス４６の二次巻線Ｓの一端に接続され、二次
巻線Ｓの他端はダイオード４９、主コンデンサ５
１、スイツチ４２を直列に介して直流電源４０の
正端子に接続される。主コンデンサ５１の両端間
に、抵抗５２、ネオン管５４が直列に接続され
る。さらに、主コンデンサ５１の両端間に、抵抗
５６、トリガスイツチ５８が直列に接続される。
抵抗５６とトリガスイツチ５８の接続点はコンデ
ンサ６０、トランス６２を介して、閃光放電管６
４のトリガ端に接続される。閃光放電管６４も主
コンデンサ５１の両端間に接続される。 An embodiment of the power supply device according to the present invention will be described below with reference to the drawings. FIG. 2 is a circuit diagram of an electroluminescent device in which one embodiment thereof is used. The positive terminal of the DC power supply 40 is connected to the emitter of an NPN transistor 43 via a switch 42, and the negative terminal is connected to the base of the transistor 43 via a resistor 44. One end of the primary winding P of the oscillation transformer 46 is connected to the positive terminal of the DC power supply 40 via the switch 42, and the other end is connected to the collector of the PNP type transistor 48. The emitter of transistor 48 is connected to the negative terminal of DC power supply 40, and the base is connected to the collector of transistor 43 via resistor 50. The base of the transistor 43 is connected to one end of the secondary winding S of the oscillation transformer 46, and the other end of the secondary winding S is connected to the diode 49 and the main capacitor 5.
1. Connected to the positive terminal of the DC power supply 40 via a switch 42 in series. A resistor 52 and a neon tube 54 are connected in series between both ends of the main capacitor 51. Further, a resistor 56 and a trigger switch 58 are connected in series between both ends of the main capacitor 51.
The connection point between the resistor 56 and the trigger switch 58 is connected to the flash discharge tube 6 via a capacitor 60 and a transformer 62.
Connected to the trigger end of 4. A flash discharge tube 64 is also connected across the main capacitor 51.
次に、この動作を説明する。スイツチ４２が閉
成されると、電源４０から抵抗４４を介してトラ
ンジスタ４３のベースに電流が流れるのでトラン
ジスタ４３が導通状態にされる。トランジスタ４
３のコレクタ電流により、トランジスタ４８も導
通状態になる。そこで、トランジスタ４３，４８
で増幅された電流が発振トランス４６の一次巻線
Ｐに流れる。ここで、二次巻線Ｓの低圧端がトラ
ンジスタ４３のベースに接続されているので、二
次側の電流が一次側に正帰還される。そのため、
トランジスタ４３，４８のコレクタ電流がさらに
増加し、トランジスタ４３，４８は飽和する。す
ると、発振トランス４６において、一次巻線Ｐか
ら二次巻線Ｓへの結合がなくなり、トランジスタ
４３のベース電流が減少し、トランジスタ４８の
コレクタ電流も減少する。したがつて、発振トラ
ンス４６の二次巻線Ｓからトランジスタ４３のベ
ースへの帰還がなくなり、トランジスタ４８が非
導通状態になる。このとき、発振トランス４６の
一次巻線Ｐに誘起されている逆起電圧が二次巻線
Ｓを介してトランジスタ４３を確実に非導通状態
にさせるとともに、発振トランス４６の内部での
容量や基板に実装される際の容量により、これら
の回路部分を流れる電流が振動される。振動電流
の正の半波がトランジスタ４３を正方向にバイア
スすると、トランジスタ４３，４８が再び導通状
態にされる。以上の動作の繰返しにより、発振ト
ランス４６は発振を持続する。 Next, this operation will be explained. When switch 42 is closed, current flows from power supply 40 to the base of transistor 43 through resistor 44, making transistor 43 conductive. transistor 4
3, the transistor 48 also becomes conductive. Therefore, transistors 43 and 48
The amplified current flows to the primary winding P of the oscillation transformer 46. Here, since the low voltage end of the secondary winding S is connected to the base of the transistor 43, the current on the secondary side is positively fed back to the primary side. Therefore,
The collector currents of transistors 43 and 48 further increase, and transistors 43 and 48 become saturated. Then, in the oscillation transformer 46, the coupling from the primary winding P to the secondary winding S is eliminated, the base current of the transistor 43 decreases, and the collector current of the transistor 48 also decreases. Therefore, there is no feedback from the secondary winding S of the oscillation transformer 46 to the base of the transistor 43, and the transistor 48 becomes non-conductive. At this time, the back electromotive force induced in the primary winding P of the oscillation transformer 46 ensures that the transistor 43 becomes non-conductive via the secondary winding S, and the capacitance inside the oscillation transformer 46 and the substrate The capacitance when mounted on the circuit causes the current flowing through these circuit parts to oscillate. When the positive half-wave of the oscillating current biases transistor 43 in the positive direction, transistors 43 and 48 become conductive again. By repeating the above operations, the oscillation transformer 46 continues to oscillate.
この発振電流がダイオード４９によつて整流さ
れ、主コンデンサ５１が充電される。主コンデン
サ５１の充電完了はネオン管５４の点灯で確認さ
れる。その後、トリガスイツチ５８が閉成される
と、閃光放電管６４がトリガされ主コンデンサ５
１の放電電流により閃光放電管６４が発光され
る。 This oscillation current is rectified by diode 49, and main capacitor 51 is charged. Completion of charging of the main capacitor 51 is confirmed by lighting of the neon tube 54. Thereafter, when the trigger switch 58 is closed, the flash discharge tube 64 is triggered and the main capacitor 5
The flash discharge tube 64 emits light with a discharge current of 1.
この実施例では、NPN型トランジスタ４８を
用いて発振トランス４６の一次巻線Ｐに流れる電
流を制御しているので小型化に適する。また、ト
ランジスタ４８を駆動するために、PNP型トラン
ジスタ４３をトランジスタ４８に接続してあるの
で、回路の利得が各トランジスタの利得の積にな
る。そのため、トランス４６に帰還巻線を設けな
くても、二次巻線Ｓからの帰還量でも充分にトラ
ンジスタ４８を飽和させることができる。すなわ
ち、バイアス抵抗４４は極めて大きくても発振が
可能である。トランジスタ４３は0.3〜0.4Vで動
作するので、この装置は低電圧でも動作可能であ
る。また、帰還巻線が不用であるので、トランス
４６の端子は４本でよく、小型化する際に耐圧が
充分保たれる。さらに、トランス４６の二次側の
高圧端子が一次側の電源４０と分離されているの
で、電撃を受ける虞れがない。 In this embodiment, the NPN transistor 48 is used to control the current flowing through the primary winding P of the oscillation transformer 46, so it is suitable for miniaturization. Further, since the PNP type transistor 43 is connected to the transistor 48 in order to drive the transistor 48, the gain of the circuit is the product of the gains of each transistor. Therefore, even if the transformer 46 is not provided with a feedback winding, the amount of feedback from the secondary winding S can sufficiently saturate the transistor 48. That is, oscillation is possible even if the bias resistor 44 is extremely large. Since transistor 43 operates at 0.3-0.4V, this device can also operate at low voltages. Further, since a feedback winding is not required, the transformer 46 only needs to have four terminals, and a sufficient withstand voltage can be maintained when downsizing. Furthermore, since the high voltage terminal on the secondary side of the transformer 46 is separated from the power source 40 on the primary side, there is no risk of receiving an electric shock.
以上説明したように、この発明によれば、低電
圧でも確実に動作し小型化に適し、電子発光装置
等に使用可能な電源装置を提供することができ
る。 As described above, according to the present invention, it is possible to provide a power supply device that operates reliably even at low voltage, is suitable for miniaturization, and can be used for electroluminescent devices and the like.
第１図は従来のストロボ用電源装置の回路図、
第２図はこの発明による電源装置の一実施例の回
路図である。
４０……直流電源、４３，４８……トランジス
タ、４４……抵抗、４６……発振トランス、４９
……ダイオード、５１……主コンデンサ、６４…
…閃光放電管。
Figure 1 is a circuit diagram of a conventional strobe power supply.
FIG. 2 is a circuit diagram of an embodiment of the power supply device according to the present invention. 40...DC power supply, 43, 48...Transistor, 44...Resistor, 46...Oscillation transformer, 49
...Diode, 51...Main capacitor, 64...
...Flash discharge tube.
Claims (1)
記第１端子にベースが接続され前記第２端子にエ
ミツタが接続されるPNP型の第１トランジスタ
と、前記第１トランジスタのコレクタにベースが
接続され前記第１端子にエミツタが接続される
NPN型の第２トランジスタと、前記第２トラン
ジスタのコレクタおよび前記第２端子間に一次巻
線が接続され前記第１トランジスタのベースに二
次巻線の一端が接続される発振トランスと、前記
発振トランスの二次巻線の他端に整流器を介して
接続されるコンデンサとを具備する電源装置。1 first and second terminals to which a DC voltage is supplied, a PNP-type first transistor whose base is connected to the first terminal and whose emitter is connected to the second terminal, and a base connected to the collector of the first transistor. is connected, and an emitter is connected to the first terminal.
an oscillation transformer having a primary winding connected between the collector of the second transistor and the second terminal, and one end of a secondary winding connected to the base of the first transistor; A power supply device comprising a capacitor connected to the other end of a secondary winding of a transformer via a rectifier.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8931680A JPS5716577A (en) | 1980-07-01 | 1980-07-01 | Power source |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8931680A JPS5716577A (en) | 1980-07-01 | 1980-07-01 | Power source |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5716577A JPS5716577A (en) | 1982-01-28 |
| JPS627779B2 true JPS627779B2 (en) | 1987-02-19 |
Family
ID=13967251
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8931680A Granted JPS5716577A (en) | 1980-07-01 | 1980-07-01 | Power source |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5716577A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5949198A (en) * | 1982-09-13 | 1984-03-21 | オリンパス光学工業株式会社 | Power source for strobe |
-
1980
- 1980-07-01 JP JP8931680A patent/JPS5716577A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5716577A (en) | 1982-01-28 |
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